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Go back to realoem and copy the 11 digit BMW part nbr...then type type "BMW xx xx x xxx xxx carbon fiber" (where x=the bmw part nbr) into a google search box and you'll get pages of results of vendors that sell the correct size roundels for the e53...and I'm sure at least one of those vendors will also mention the diameter of the Roundels (the e53's hood & tailgate Roundels have different part nbrs).

When looking/shopping for parts...if you use the correct part nbr in your search, it helps pin-point the correct part from the start.

Go back to realoem and copy the 11 digit BMW part nbr...then type type "BMW xx xx x xxx xxx carbon fiber" (where x=the bmw part nbr) into a google search box and you'll get pages of results of vendors that sell the correct size roundels for the e53...and I'm sure at least one of those vendors will also mention the diameter of the Roundels (the e53's hood & tailgate Roundels have different part nbrs).

When looking/shopping for parts...if you use the correct part nbr in your search, it helps pin-point the correct part from the start.